Legislation to beef up investigations into unsolved murders from the civil rights era looked like it would breeze through Congress. The House passed it 422-2 this summer. Its Senate sponsors included some of the most senior Democrats and Republicans on Capitol Hill.

More than half a century after 14-year-old Emmett Till was brutally murdered in Mississippi for whistling at a white woman, his family sat down with federal investigators to discuss the final autopsy on the boy's exhumed body and to hear about the investigation.

Even as the U.S. Department of Justice was announcing a fresh look at unsolved civil rights-era killings around the South, a Mississippi Delta prosecutor was closing the books on perhaps the most notorious of those cold cases the brutal 1955 murder of 14-year-old Emmett Till.

A grand jury that looked into the 1955 slaying of Emmett Till a black teenager who was killed after he whistled at a white woman in the Mississippi Delta has refused to indict her, all but closing the books on a crime that galvanized the civil rights movement.

Federal officials plan to announce today they will expand the number of old civil rights murder cases reopened for investigation. The FBI has uncovered 51 unresolved killings from that era, and the Southern Poverty Law Center has a list of 127 race-related killings between 1954 and 1968.

Among Ed Bradley's notable reports: An exclusive interview with condemned Oklahoma City bomber Timothy McVeigh that aired in March 2000.His 2001 report on the Columbine massacre, revealing that authorities ignored warnings about the young shooters that could have prevented the massacre.